mirror of
https://github.com/strukturag/nextcloud-spreed-signaling.git
synced 2025-03-14 19:42:48 +00:00
321 lines
10 KiB
Go
321 lines
10 KiB
Go
/**
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* Standalone signaling server for the Nextcloud Spreed app.
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* Copyright (C) 2017 struktur AG
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*
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* @author Joachim Bauch <bauch@struktur.de>
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*
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* @license GNU AGPL version 3 or any later version
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Affero General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Affero General Public License for more details.
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*
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* You should have received a copy of the GNU Affero General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package signaling
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import (
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"context"
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"fmt"
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"log"
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"strconv"
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"github.com/notedit/janus-go"
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)
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type mcuJanusSubscriber struct {
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mcuJanusClient
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publisher string
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}
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func (p *mcuJanusSubscriber) Publisher() string {
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return p.publisher
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}
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func (p *mcuJanusSubscriber) handleEvent(event *janus.EventMsg) {
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if videoroom := getPluginStringValue(event.Plugindata, pluginVideoRoom, "videoroom"); videoroom != "" {
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ctx := context.TODO()
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switch videoroom {
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case "destroyed":
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log.Printf("Subscriber %d: associated room has been destroyed, closing", p.handleId)
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go p.Close(ctx)
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case "event":
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// Handle renegotiations, but ignore other events like selected
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// substream / temporal layer.
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if getPluginStringValue(event.Plugindata, pluginVideoRoom, "configured") == "ok" &&
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event.Jsep != nil && event.Jsep["type"] == "offer" && event.Jsep["sdp"] != nil {
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p.listener.OnUpdateOffer(p, event.Jsep)
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}
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case "slow_link":
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// Ignore, processed through "handleSlowLink" in the general events.
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default:
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log.Printf("Unsupported videoroom event %s for subscriber %d: %+v", videoroom, p.handleId, event)
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}
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} else {
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log.Printf("Unsupported event for subscriber %d: %+v", p.handleId, event)
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}
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}
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func (p *mcuJanusSubscriber) handleHangup(event *janus.HangupMsg) {
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log.Printf("Subscriber %d received hangup (%s), closing", p.handleId, event.Reason)
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go p.Close(context.Background())
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}
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func (p *mcuJanusSubscriber) handleDetached(event *janus.DetachedMsg) {
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log.Printf("Subscriber %d received detached, closing", p.handleId)
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go p.Close(context.Background())
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}
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func (p *mcuJanusSubscriber) handleConnected(event *janus.WebRTCUpMsg) {
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log.Printf("Subscriber %d received connected", p.handleId)
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p.mcu.SubscriberConnected(p.Id(), p.publisher, p.streamType)
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}
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func (p *mcuJanusSubscriber) handleSlowLink(event *janus.SlowLinkMsg) {
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if event.Uplink {
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log.Printf("Subscriber %s (%d) is reporting %d lost packets on the uplink (Janus -> client)", p.listener.PublicId(), p.handleId, event.Lost)
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} else {
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log.Printf("Subscriber %s (%d) is reporting %d lost packets on the downlink (client -> Janus)", p.listener.PublicId(), p.handleId, event.Lost)
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}
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}
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func (p *mcuJanusSubscriber) handleMedia(event *janus.MediaMsg) {
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// Only triggered for publishers
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}
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func (p *mcuJanusSubscriber) NotifyReconnected() {
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ctx, cancel := context.WithTimeout(context.Background(), p.mcu.settings.Timeout())
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defer cancel()
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handle, pub, err := p.mcu.getOrCreateSubscriberHandle(ctx, p.publisher, p.streamType)
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if err != nil {
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// TODO(jojo): Retry?
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log.Printf("Could not reconnect subscriber for publisher %s: %s", p.publisher, err)
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p.Close(context.Background())
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return
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}
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p.handle = handle
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p.handleId = handle.Id
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p.roomId = pub.roomId
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p.sid = strconv.FormatUint(handle.Id, 10)
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p.listener.SubscriberSidUpdated(p)
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log.Printf("Subscriber %d for publisher %s reconnected on handle %d", p.id, p.publisher, p.handleId)
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}
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func (p *mcuJanusSubscriber) Close(ctx context.Context) {
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p.mu.Lock()
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closed := p.closeClient(ctx)
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p.mu.Unlock()
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if closed {
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p.mcu.SubscriberDisconnected(p.Id(), p.publisher, p.streamType)
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statsSubscribersCurrent.WithLabelValues(string(p.streamType)).Dec()
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}
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p.mcu.unregisterClient(p)
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p.listener.SubscriberClosed(p)
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p.mcuJanusClient.Close(ctx)
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}
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func (p *mcuJanusSubscriber) joinRoom(ctx context.Context, stream *streamSelection, callback func(error, map[string]interface{})) {
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handle := p.handle
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if handle == nil {
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callback(ErrNotConnected, nil)
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return
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}
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waiter := p.mcu.publisherConnected.NewWaiter(getStreamId(p.publisher, p.streamType))
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defer p.mcu.publisherConnected.Release(waiter)
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loggedNotPublishingYet := false
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retry:
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join_msg := map[string]interface{}{
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"request": "join",
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"ptype": "subscriber",
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"room": p.roomId,
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}
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if p.mcu.isMultistream() {
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join_msg["streams"] = []map[string]interface{}{
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{
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"feed": streamTypeUserIds[p.streamType],
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},
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}
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} else {
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join_msg["feed"] = streamTypeUserIds[p.streamType]
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}
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if stream != nil {
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stream.AddToMessage(join_msg)
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}
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join_response, err := handle.Message(ctx, join_msg, nil)
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if err != nil {
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callback(err, nil)
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return
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}
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if error_code := getPluginIntValue(join_response.Plugindata, pluginVideoRoom, "error_code"); error_code > 0 {
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switch error_code {
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case JANUS_VIDEOROOM_ERROR_ALREADY_JOINED:
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// The subscriber is already connected to the room. This can happen
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// if a client leaves a call but keeps the subscriber objects active.
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// On joining the call again, the subscriber tries to join on the
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// MCU which will fail because he is still connected.
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// To get a new Offer SDP, we have to tear down the session on the
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// MCU and join again.
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p.mu.Lock()
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p.closeClient(ctx)
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p.mu.Unlock()
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var pub *mcuJanusPublisher
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handle, pub, err = p.mcu.getOrCreateSubscriberHandle(ctx, p.publisher, p.streamType)
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if err != nil {
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// Reconnection didn't work, need to unregister/remove subscriber
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// so a new object will be created if the request is retried.
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p.mcu.unregisterClient(p)
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p.listener.SubscriberClosed(p)
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callback(fmt.Errorf("Already connected as subscriber for %s, error during re-joining: %s", p.streamType, err), nil)
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return
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}
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p.handle = handle
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p.handleId = handle.Id
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p.roomId = pub.roomId
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p.sid = strconv.FormatUint(handle.Id, 10)
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p.listener.SubscriberSidUpdated(p)
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p.closeChan = make(chan struct{}, 1)
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go p.run(p.handle, p.closeChan)
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log.Printf("Already connected subscriber %d for %s, leaving and re-joining on handle %d", p.id, p.streamType, p.handleId)
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goto retry
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case JANUS_VIDEOROOM_ERROR_NO_SUCH_ROOM:
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fallthrough
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case JANUS_VIDEOROOM_ERROR_NO_SUCH_FEED:
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switch error_code {
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case JANUS_VIDEOROOM_ERROR_NO_SUCH_ROOM:
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log.Printf("Publisher %s not created yet for %s, wait and retry to join room %d as subscriber", p.publisher, p.streamType, p.roomId)
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case JANUS_VIDEOROOM_ERROR_NO_SUCH_FEED:
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log.Printf("Publisher %s not sending yet for %s, wait and retry to join room %d as subscriber", p.publisher, p.streamType, p.roomId)
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}
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if !loggedNotPublishingYet {
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loggedNotPublishingYet = true
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statsWaitingForPublisherTotal.WithLabelValues(string(p.streamType)).Inc()
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}
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if err := waiter.Wait(ctx); err != nil {
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callback(err, nil)
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return
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}
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log.Printf("Retry subscribing %s from %s", p.streamType, p.publisher)
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goto retry
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default:
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// TODO(jojo): Should we handle other errors, too?
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callback(fmt.Errorf("Error joining room as subscriber: %+v", join_response), nil)
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return
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}
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}
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//log.Println("Joined as listener", join_response)
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p.session = join_response.Session
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callback(nil, join_response.Jsep)
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}
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func (p *mcuJanusSubscriber) update(ctx context.Context, stream *streamSelection, callback func(error, map[string]interface{})) {
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handle := p.handle
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if handle == nil {
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callback(ErrNotConnected, nil)
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return
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}
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configure_msg := map[string]interface{}{
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"request": "configure",
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"update": true,
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}
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if stream != nil {
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stream.AddToMessage(configure_msg)
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}
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configure_response, err := handle.Message(ctx, configure_msg, nil)
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if err != nil {
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callback(err, nil)
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return
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}
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callback(nil, configure_response.Jsep)
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}
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func (p *mcuJanusSubscriber) SendMessage(ctx context.Context, message *MessageClientMessage, data *MessageClientMessageData, callback func(error, map[string]interface{})) {
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statsMcuMessagesTotal.WithLabelValues(data.Type).Inc()
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jsep_msg := data.Payload
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switch data.Type {
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case "requestoffer":
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fallthrough
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case "sendoffer":
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p.deferred <- func() {
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msgctx, cancel := context.WithTimeout(context.Background(), p.mcu.settings.Timeout())
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defer cancel()
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stream, err := parseStreamSelection(jsep_msg)
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if err != nil {
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go callback(err, nil)
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return
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}
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if data.Sid == "" || data.Sid != p.Sid() {
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p.joinRoom(msgctx, stream, callback)
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} else {
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p.update(msgctx, stream, callback)
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}
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}
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case "answer":
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p.deferred <- func() {
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msgctx, cancel := context.WithTimeout(context.Background(), p.mcu.settings.Timeout())
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defer cancel()
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if data.Sid == "" || data.Sid == p.Sid() {
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p.sendAnswer(msgctx, jsep_msg, callback)
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} else {
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go callback(fmt.Errorf("Answer message sid (%s) does not match subscriber sid (%s)", data.Sid, p.Sid()), nil)
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}
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}
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case "candidate":
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p.deferred <- func() {
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msgctx, cancel := context.WithTimeout(context.Background(), p.mcu.settings.Timeout())
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defer cancel()
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if data.Sid == "" || data.Sid == p.Sid() {
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p.sendCandidate(msgctx, jsep_msg["candidate"], callback)
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} else {
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go callback(fmt.Errorf("Candidate message sid (%s) does not match subscriber sid (%s)", data.Sid, p.Sid()), nil)
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}
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}
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case "endOfCandidates":
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// Ignore
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case "selectStream":
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stream, err := parseStreamSelection(jsep_msg)
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if err != nil {
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go callback(err, nil)
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return
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}
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if stream == nil || !stream.HasValues() {
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// Nothing to do
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go callback(nil, nil)
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return
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}
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p.deferred <- func() {
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msgctx, cancel := context.WithTimeout(context.Background(), p.mcu.settings.Timeout())
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defer cancel()
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p.selectStream(msgctx, stream, callback)
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}
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default:
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// Return error asynchronously
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go callback(fmt.Errorf("Unsupported message type: %s", data.Type), nil)
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}
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}
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